Used just like a pen, the Pen Style Chaco Liners fine point permits accurate drawing of both straight lines and free hand curves. The fine point makes lines and marks more visible and is easy to use with a straight edge ruler. Pat the powdered ink to erase lines and marks.  For use on WASHABLE fabrics only.  Test the pen on a scrap piece of fabric first.  Easy replacement refill available.  From Clover.